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Information Security & Multimedia Security Lab
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A lab that explores topics ranging from cryptography and information security to AI security.
AboutAbout the lab
Exploring cryptography and information security
The Information Security & Multimedia Security Lab focuses on cryptography and information security, and also takes up research themes such as artificial intelligence and blockchain.
Professor Koichi Sakurai is interested in the complexity that appears where information meets fields such as computing, mathematics, physics, biology, and economics, and analyzes its structure.
The lab's research themes include AI security, as well as quantum cryptography, privacy, and cybersecurity.
Key terms
- Blockchain
- A mechanism in which data is managed in a distributed way by multiple participants, making it difficult to tamper with.
- Federated learning
- A method in which multiple participants cooperate to train a single model while each keeps its data on its own side
ResearchResearch themes
This lab has continued research on cryptography and information security. In recent years it has made the security of artificial intelligence a research theme, and it also works on applications of blockchain and on the security of cryptographic implementations.
*Illustrative imageAI security
The lab studies the security of artificial intelligence. One of its recent papers deals with a method that protects intellectual property by embedding a watermark in models built through federated learning.
*Illustrative imageProtecting cryptographic implementations
As a countermeasure against side-channel attacks, which probe cryptographic processing from outside the device, the lab studies a method of shuffling the order in which data is processed, as well as methods for verifying its security.
*Illustrative imageApplications of blockchain
The lab has a paper that designed and implemented, using the blockchain platform Hyperledger Fabric, a mechanism for securely exchanging vehicle data and tracking the distribution history of food.
MembersFaculty
- ProfessorKoichi Sakurai
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Homomorphic Encryption Setup” Aaadir / CC0 (cropped)
- AI security: “Enigma Deutsches Museum” Ypsilon from Finland / CC0 (cropped)
- Protecting cryptographic implementations: “Xerox ColorQube 8570 - Main controller - Smart Card-0420” Raimond Spekking / CC BY-SA 4.0 (cropped)
- Applications of blockchain: “Blockchain books Donner Rotterdam 22 Dec 2017” Someone Not Awful / CC BY-SA 4.0 (cropped)
- Related lab (アルゴリズム論研究室): “Jungheinrich Autonomous Robot arculee M” Marc Auledas Noguera (Auledas) / CC BY 4.0 (cropped)
- Related lab (数理工学及び情報回路研究室): “Communication theory” JuanOF9 / CC BY-SA 4.0 (cropped)
- Related lab (文字列学研究室): “A diagram of the Aho-Corasick string search algorithm extracted” User:Algorithmist / CC0 (cropped)
- Related lab (Laboratory of Intelligent Systems): “Aprendizado por Reforço” Leomaurodesenv / CC0 (cropped)
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